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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/* -*- mode: C; c-basic-offset: 4; intent-tabs-mode: nil -*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * This file is part of the public interface to the Sifteo SDK.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * Copyright &lt;c&gt; 2012 Sifteo, Inc. All rights reserved.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;</div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#ifdef NOT_USERSPACE</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#   error This is a userspace-only header, not allowed by the current build.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;sifteo/menu/types.h&gt;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="keyword">namespace </span>Sifteo {</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Menu::detectNeighbors()</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;{</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;    Neighborhood nbr(vid-&gt;cube());</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;    <span class="keywordflow">for</span> (<a class="code" href="group__cube.html#ga8dc17340f515227e9bb34532bfc2fef3" title="An enumeration which names the four sides of a Sifteo cube.">Side</a> i = <a class="code" href="group__cube.html#ga8dc17340f515227e9bb34532bfc2fef3" title="An enumeration which names the four sides of a Sifteo cube.">Side</a>(0); i &lt; <a class="code" href="group__cube.html#gga8dc17340f515227e9bb34532bfc2fef3acfd3767ac3e69432b6a0bd7106c35f4e" title="Total number of sides (4)">NUM_SIDES</a>; i++) {</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        MenuNeighbor n;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;        <span class="keywordflow">if</span> (nbr.hasCubeAt(i)) {</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;            CubeID c(nbr.cubeAt(i));</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;            n.neighborSide = Neighborhood(c).sideOf(vid-&gt;cube());</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;            n.neighbor = c;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;            n.masterSide = i;</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;        } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;            n.neighborSide = <a class="code" href="group__cube.html#gga8dc17340f515227e9bb34532bfc2fef3a907c90c21486c90c851379c9dd79b1b8" title="Nil value (-1)">NO_SIDE</a>;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;            n.neighbor = <a class="code" href="struct_sifteo_1_1_cube_i_d.html#ac9ab1ce1985b9cc8adf58912ce805fce" title="A reserved ID, used to mark undefined CubeIDs.">CubeID::UNDEFINED</a>;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;            n.masterSide = <a class="code" href="group__cube.html#gga8dc17340f515227e9bb34532bfc2fef3a907c90c21486c90c851379c9dd79b1b8" title="Nil value (-1)">NO_SIDE</a>;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        }</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        <span class="keywordflow">if</span> (n != neighbors[i]) {</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;            <span class="comment">// Neighbor was set but is now different/gone</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;            <span class="keywordflow">if</span> (neighbors[i].neighbor != <a class="code" href="struct_sifteo_1_1_cube_i_d.html#ac9ab1ce1985b9cc8adf58912ce805fce" title="A reserved ID, used to mark undefined CubeIDs.">CubeID::UNDEFINED</a>) {</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;                <span class="comment">// Generate a lost neighbor event, with the ghost of the lost cube.</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;                currentEvent.type = MENU_NEIGHBOR_REMOVE;</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;                currentEvent.neighbor = neighbors[i];</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;                <span class="comment">/* Act as if the neighbor was lost, even if it wasn&#39;t. We&#39;ll</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment">                 * synthesize another event on the next run of the event loop</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">                 * if the neighbor was replaced by another cube in less than</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">                 * one polling cycle.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">                 */</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;                neighbors[i].neighborSide = <a class="code" href="group__cube.html#gga8dc17340f515227e9bb34532bfc2fef3a907c90c21486c90c851379c9dd79b1b8" title="Nil value (-1)">NO_SIDE</a>;</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;                neighbors[i].neighbor = <a class="code" href="struct_sifteo_1_1_cube_i_d.html#ac9ab1ce1985b9cc8adf58912ce805fce" title="A reserved ID, used to mark undefined CubeIDs.">CubeID::UNDEFINED</a>;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;                neighbors[i].masterSide = <a class="code" href="group__cube.html#gga8dc17340f515227e9bb34532bfc2fef3a907c90c21486c90c851379c9dd79b1b8" title="Nil value (-1)">NO_SIDE</a>;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;            } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;                neighbors[i] = n;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;                currentEvent.type = MENU_NEIGHBOR_ADD;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;                currentEvent.neighbor = n;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;            }</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;            <span class="comment">/* We don&#39;t have a method of queueing events, so return as soon as</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">             * a change is discovered. If there are other changes, the next run</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">             * of the event loop will discover them.</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">             */</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;            <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        }</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    }</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;}</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="keyword">inline</span> uint8_t Menu::computeSelected()</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;{</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    <span class="keywordtype">int</span> s = (position + (kItemPixelWidth() / 2)) / kItemPixelWidth();</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    <span class="keywordflow">return</span> <a class="code" href="group__math.html#ga7d41be453074674182cb7d1d7c759d91" title="For any type, clamp a value to the extremes &#39;low&#39; and &#39;high&#39;.">clamp</a>(s, 0, numItems - 1);</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;}</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Menu::checkForPress()</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;{</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    <span class="keywordtype">bool</span> touch = vid-&gt;cube().isTouching();</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="keywordflow">if</span> (touch &amp;&amp; !prevTouch) {</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        currentEvent.type = MENU_ITEM_PRESS;</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        currentEvent.item = computeSelected();</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    }</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    prevTouch = touch;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;}</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">// positions are in pixel units</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment">// columns are in tile-units</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="comment">// each icon is 80px/10tl wide with a 16px/2tl spacing</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Menu::drawColumn(<span class="keywordtype">int</span> x)</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;{</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    <span class="comment">// x is the column in &quot;global&quot; space</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    <a class="code" href="group__math.html#ga4aa5e1c76d3adebd72a73a7051ad1fe0" title="Typedef for a 2-vector of ints.">Int2</a> topLeft = { <a class="code" href="group__math.html#gacd70c1d896652ae6cd08793202b929bf" title="Compute the unsigned remainder from dividing two signed integers.">umod</a>(x, kNumTilesX), 0 };</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    <a class="code" href="group__math.html#ga4aa5e1c76d3adebd72a73a7051ad1fe0" title="Typedef for a 2-vector of ints.">Int2</a> size = { 1, kIconTileHeight };</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    <span class="comment">// icon or blank column?</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <span class="keywordflow">if</span> (itemAtCol(x) &lt; numItems) {</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        <span class="comment">// drawing an icon column</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;        <span class="keyword">const</span> AssetImage &amp;img = *items[itemAtCol(x)].icon;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;        <a class="code" href="group__math.html#ga4aa5e1c76d3adebd72a73a7051ad1fe0" title="Typedef for a 2-vector of ints.">Int2</a> srcXY = { ((x % kItemTileWidth()) % img.tileWidth()), 0 };</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;        vid-&gt;bg0.image(topLeft, size, img, srcXY);</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        <span class="keywordflow">if</span> (assets-&gt;overflowIcon &amp;&amp; <a class="code" href="group__math.html#gacd70c1d896652ae6cd08793202b929bf" title="Compute the unsigned remainder from dividing two signed integers.">umod</a>(x,kIconTileWidth) &lt; kItemTileWidth()) {</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;            <span class="comment">// drawing the overflow icon</span></div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;            x = <a class="code" href="group__math.html#gacd70c1d896652ae6cd08793202b929bf" title="Compute the unsigned remainder from dividing two signed integers.">umod</a>(x, kItemTileWidth());</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;            <span class="keyword">const</span> AssetImage &amp;img = *assets-&gt;overflowIcon;</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;            <a class="code" href="group__math.html#ga4aa5e1c76d3adebd72a73a7051ad1fe0" title="Typedef for a 2-vector of ints.">Int2</a> srcXY = { ((x % kItemTileWidth()) % img.tileWidth()), 0 };</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;            vid-&gt;bg0.image(topLeft, size, img, srcXY);</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;        } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;            <span class="comment">// drawing a blank column</span></div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;            vid-&gt;bg0.fill(topLeft, size, *assets-&gt;background);</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        }</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    }</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;}</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Menu::drawFooter(<span class="keywordtype">bool</span> force)</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;{</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    <span class="keywordflow">if</span> (numTips == 0) <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    <span class="keyword">const</span> AssetImage&amp; footer = *assets-&gt;tips[currentTip];</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">float</span> kSecondsPerTip = 4.f;</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    <span class="keywordflow">if</span> (<a class="code" href="class_sifteo_1_1_system_time.html#a818459cc9bf7c347d117f6b6d77104fd" title="Returns a new SystemTime representing the current system clock value.">SystemTime::now</a>() - prevTipTime &gt; kSecondsPerTip || force) {</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;        prevTipTime = <a class="code" href="class_sifteo_1_1_system_time.html#a818459cc9bf7c347d117f6b6d77104fd" title="Returns a new SystemTime representing the current system clock value.">SystemTime::now</a>();</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;        <span class="keywordflow">if</span> (numTips &gt; 0) {</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;            currentTip = (currentTip+1) % numTips;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;        }</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;        <a class="code" href="group__math.html#ga4aa5e1c76d3adebd72a73a7051ad1fe0" title="Typedef for a 2-vector of ints.">Int2</a> topLeft = { 0, kNumVisibleTilesY - footer.tileHeight() };</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        vid-&gt;bg1.image(topLeft, footer);</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    }</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;}</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">int</span> Menu::stoppingPositionFor(<span class="keywordtype">int</span> selected)</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;{</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;    <span class="keywordflow">return</span> kItemPixelWidth() * selected;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;}</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">float</span> Menu::velocityMultiplier()</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;{</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    <span class="keywordflow">return</span> <a class="code" href="group__math.html#gadfdd37c09079cfe60965b09b186a24f0" title="For any type, return the absolute value.">abs</a>(accel.x) &gt; kAccelThresholdStep ? (1.f * kMaxSpeedMultiplier) : 1.f;</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;}</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">float</span> Menu::maxVelocity()</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;{</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">float</span> kMaxNormalSpeed = 40.f;</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    <span class="keywordflow">return</span> kMaxNormalSpeed *</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;        <span class="comment">// x-axis linear limit</span></div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;        (<a class="code" href="group__math.html#gadfdd37c09079cfe60965b09b186a24f0" title="For any type, return the absolute value.">abs</a>(accel.x) / kOneG()) *</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;        <span class="comment">// y-axis multiplier</span></div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;        velocityMultiplier();</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;}</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">float</span> Menu::lerp(<span class="keywordtype">float</span> min, <span class="keywordtype">float</span> max, <span class="keywordtype">float</span> u)</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;{</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    <span class="keywordflow">return</span> min + u * (max - min);</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;}</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Menu::updateBG0()</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;{</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;    <span class="keywordtype">int</span> ut = computeCurrentTile();</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    <span class="keywordflow">while</span>(prev_ut &lt; ut) {</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;        drawColumn(++prev_ut + kNumVisibleTilesX);</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    }</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    <span class="keywordflow">while</span>(prev_ut &gt; ut) {</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;        drawColumn(--prev_ut);</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;    }</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;    {</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;        <a class="code" href="group__math.html#ga4aa5e1c76d3adebd72a73a7051ad1fe0" title="Typedef for a 2-vector of ints.">Int2</a> <a class="code" href="group__math.html#gab18c9af04a4a3a4a3c63656e40ab74ed" title="Create a Vector2, from a set of (x,y) coordinates.">vec</a> = {(position - kEndCapPadding), kIconYOffset};</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;        vid-&gt;bg0.setPanning(vec);</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;    }</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;}</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">bool</span> Menu::itemVisibleAtCol(uint8_t item, <span class="keywordtype">int</span> column)</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;{</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;    <a class="code" href="group__macros.html#ga8a15779356736a0900a162442b1cda53" title="Runtime debug assertion.">ASSERT</a>(item &gt;= 0 &amp;&amp; item &lt; numItems);</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;    <span class="keywordflow">if</span> (column &lt; 0) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    <span class="keywordflow">return</span> itemAtCol(column) == item;</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;}</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;<span class="keyword">inline</span> uint8_t Menu::itemAtCol(<span class="keywordtype">int</span> column)</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;{</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;    <span class="keywordflow">if</span> (column &lt; 0) <span class="keywordflow">return</span> numItems;</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;    <span class="keywordflow">if</span> (column % kItemTileWidth() &lt; kIconTileWidth) {</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;        <span class="keywordflow">return</span> column &lt; 0 ? numItems : column / kItemTileWidth();</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;    }</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;    <span class="keywordflow">return</span> numItems;</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;}</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">int</span> Menu::computeCurrentTile()</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;{</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;    <span class="comment">/* these are necessary if the icon widths are an odd number of tiles,</span></div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;<span class="comment">     * because the position is no longer aligned with the tile domain.</span></div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> kPixelsPerTile = TILE;</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> kPositionAlignment = kEndCapPadding % kPixelsPerTile == 0</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;        ? 0 : kPixelsPerTile - kEndCapPadding % kPixelsPerTile;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> kTilePadding = kEndCapPadding / kPixelsPerTile;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;    <span class="keywordtype">int</span> ui = position - kPositionAlignment;</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;    <span class="keywordtype">int</span> ut = (ui &lt; 0 ? ui - kPixelsPerTile : ui) / kPixelsPerTile; <span class="comment">// special case because int rounds up when &lt; 0</span></div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;    ut -= kTilePadding;</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;    <span class="keywordflow">return</span> ut;</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;}</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;};  <span class="comment">// namespace Sifteo</span></div>
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